Revenge of the Broads cruiser [bathtub]

Well on and off over the last few weeks I have been stripping out all of the internals of the bathtub, it now floats 6 inchs higher in the water and is one big open space with a BMC stuck up near the stern!
Today I have been repairing the roof the strengthening chipboard which is laminated into the roof and sides had taken in water and was a right mess, I have had to cut it out strip it back to fibreglass ready to glass some marine ply in to replace it. It is literally one third of the roof that needs this doing so its hard work and very messy! I had turned on the aux power for the radio and was happily chipping away at the damp board when I could smell burning, I turned around and the fuel feed to the engine was literally on fire [plastic surrounding steel braided hose] well I had to decide fast was it better to run and claim on the insurance or stay and stop it going up? I decided to stay and disconnected the engine battery and the aux batteries which stopped it but I have no idea what has happened and no intention of connecting batteries to find out!! I knew the previous owner was a bodger but the wiring on the boat is a right mess so it will be rip it out and start again I think